17-863

parting zone (of a road tunnel)

first part of the open road directly after the exit portal of a tunnel

NOTE The parting zone is not a part of the tunnel, but it is closely related to the tunnel lighting. The parting zone begins at the exit portal. It is advised that the length of the parting zone is equal to 2 times the stopping distance. A length of more than 200 m is not necessary.

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